Add GrAASmallPathRenderer.

src/gpu/GrSWMaskHelper.cpp

Index: src/gpu/GrSWMaskHelper.cpp
diff --git a/src/gpu/GrSWMaskHelper.cpp b/src/gpu/GrSWMaskHelper.cpp
index c80a13ccd02aafa76e1184e2a075b0dd27cf6b8d..90aab9030faf358410ea5bff1d9eca57994b7ad3 100644
--- a/src/gpu/GrSWMaskHelper.cpp
+++ b/src/gpu/GrSWMaskHelper.cpp
@@ -12,6 +12,7 @@
 #include "GrGpu.h"
 
 #include "SkData.h"
+#include "SkDistanceFieldGen.h"
 #include "SkStrokeRec.h"
 
 // TODO: try to remove this #include
@@ -306,6 +307,16 @@ void GrSWMaskHelper::toTexture(GrTexture *texture) {
     }
 }
 
+/**
+ * Convert mask generation results to a signed distance field
+ */
+void GrSWMaskHelper::toSDF(unsigned char* sdf) {
+    SkAutoLockPixels alp(fBM);
+    
+    SkGenerateDistanceFieldFromA8Image(sdf, (const unsigned char*)fBM.getPixels(),
+                                       fBM.width(), fBM.height(), fBM.rowBytes());
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 /**
  * Software rasterizes path to A8 mask (possibly using the context's matrix)